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# Copyright 2015 Dyn Inc.
#
# Author: Yasha Bubnov <ybubnov@dyn.com>
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import itertools
import dns.rdata
import dns.rdataclass
import dns.rdatatype
from oslo_concurrency import lockutils
from oslo_config import cfg
from oslo_log import log as logging
from designate.backend.agent_backend import base
from designate import exceptions
from designate import utils
CFG_GROUP_NAME = 'backend:agent:denominator'
LOG = logging.getLogger(__name__)
class Denominator(object):
def __init__(self, config):
super(Denominator, self).__init__()
self.config = config
def update_record(self, zone, **kwargs):
return self._execute(['record', '-z', zone, 'replace'], kwargs)
def create_record(self, zone, **kwargs):
return self._execute(['record', '-z', zone, 'add'], kwargs)
def delete_record(self, zone, **kwargs):
return self._execute(['record', '-z', zone, 'delete'], kwargs)
def get_record(self, zone, **kwargs):
return self._execute(['record', '-z', zone, 'get'], kwargs)
def get_records(self, zone, **kwargs):
return self._execute(['record', '-z', zone, 'list'], kwargs)
def create_zone(self, **kwargs):
return self._execute(['zone', 'add'], kwargs)
def update_zone(self, **kwargs):
return self._execute(['zone', 'update'], kwargs)
def delete_zone(self, **kwargs):
return self._execute(['zone', 'delete'], kwargs)
def _params(self, **kwargs):
params = [('--%s' % k, str(v)) for k, v in kwargs.items()]
return list(itertools.chain(*params))
def _base(self):
call = ['denominator', '-q', '-n', self.config.name]
# NOTE: When path to denominator configuration file is omitted,
# ~/.denominatorconfig file will be used by default.
if self.config.config_file:
call.extend(['-C', self.config.config_file])
return call
def _execute(self, op, kwargs):
try:
call = self._base() + op + self._params(**kwargs)
LOG.debug(('Executing Denominator call: %s' % ' '.join(call)))
stdout, _ = utils.execute(*call)
return stdout
except utils.processutils.ProcessExecutionError as e:
LOG.debug('Denominator call failure: %s' % e)
raise exceptions.DesignateException(e)
class DenominatorBackend(base.AgentBackend):
__plugin_name__ = 'denominator'
__backend_status__ = 'untested'
def __init__(self, agent_service):
super(DenominatorBackend, self).__init__(agent_service)
self.denominator = Denominator(
cfg.CONF[CFG_GROUP_NAME])
def start(self):
LOG.info("Started Denominator backend")
def stop(self):
LOG.info("Stopped Denominator backend")
def find_zone_serial(self, zone_name):
LOG.debug("Finding %s", zone_name)
zone_name = zone_name.rstrip('.')
output = self.denominator.get_record(
zone=zone_name,
type='SOA',
name=zone_name)
try:
text = ' '.join(output.split()[3:])
rdata = dns.rdata.from_text(dns.rdataclass.IN,
dns.rdatatype.SOA,
text)
except Exception:
return None
return rdata.serial
def create_zone(self, zone):
LOG.debug("Creating %s", zone.origin.to_text())
zone_name = zone.origin.to_text(omit_final_dot=True)
if isinstance(zone_name, bytes):
zone_name = zone_name.decode('utf-8')
# Use SOA TTL as zone default TTL
soa_record = zone.find_rrset(zone.origin, dns.rdatatype.SOA)
rname = list(soa_record.items)[0].rname.derelativize(
origin=zone.origin)
# Lock zone to prevent concurrent changes.
with self._sync_zone(zone.origin):
# NOTE: If zone already exists, denominator will update it with
# new values, in other a duplicate zone will be created if
# provider supports such functionality.
self.denominator.create_zone(
name=zone_name,
ttl=soa_record.ttl,
email=rname)
# Add records one by one.
for name, ttl, rtype, data in self._iterate_records(zone):
# Some providers do not support creation of SOA record.
rdatatype = dns.rdatatype.from_text(rtype)
if rdatatype == dns.rdatatype.SOA:
continue
self.denominator.create_record(
zone=zone_name,
name=name,
type=rtype,
ttl=ttl,
data=data)
def update_zone(self, zone):
LOG.debug("Updating %s", zone.origin)
zone_name = zone.origin.to_text(omit_final_dot=True)
if isinstance(zone_name, bytes):
zone_name = zone_name.decode('utf-8')
soa_record = zone.find_rrset(zone.origin, dns.rdatatype.SOA)
rname = list(soa_record.items)[0].rname.derelativize(
origin=zone.origin)
with self._sync_zone(zone.origin):
# Update zone with a new parameters
self.denominator.update_zone(
id=zone_name,
ttl=soa_record.ttl,
email=rname)
# Fetch records to create a differential update of a zone.
output = self.denominator.get_records(zone_name)
subzones = dict()
# subzones dict will contain names of subzones without
# trailing dot.
for raw in output.splitlines():
data = raw.split()
name, rtype = data[0], data[1]
rtypes = subzones.get(name, set())
rtypes.add(rtype)
subzones[name] = rtypes
for name, ttl, rtype, data in self._iterate_records(zone):
record_action = self.denominator.create_record
if name in subzones and rtype in subzones[name]:
# When RR set already exists, replace it with a new one.
rdatatype = dns.rdatatype.from_text(rtype)
record_action = self.denominator.update_record
# So next call will ADD a new record to record set
# instead of replacing of the existing one.
subzones[name].remove(rtype)
# NOTE: DynECT does not support deleting of the SOA
# record. Skip updating of the SOA record.
if rdatatype == dns.rdatatype.SOA:
continue
record_action(zone=zone_name,
name=name,
type=rtype,
ttl=ttl,
data=data)
# Remaining records should be deleted
for name, types in subzones.items():
for rtype in types:
self.denominator.delete_record(
zone=zone_name, id=name, type=rtype)
def delete_zone(self, zone_name):
LOG.debug('Delete Zone: %s' % zone_name)
with self._sync_zone(zone_name):
self.denominator.delete_zone(id=zone_name)
def _sync_zone(self, zone_name):
LOG.debug('Synchronising zone: %s' % zone_name)
return lockutils.lock('denominator-%s' % zone_name)
def _iterate_records(self, zone):
for rname, ttl, rdata in zone.iterate_rdatas():
name = rname.derelativize(origin=zone.origin)
name = name.to_text(omit_final_dot=True)
if isinstance(name, bytes):
name = name.decode('utf-8')
data = rdata.to_text(origin=zone.origin, relativize=False)
yield name, ttl, dns.rdatatype.to_text(rdata.rdtype), data
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